View ds1815 datasheet:

DS1815 3.3V EconoReset with Push-Pull Output www.maxim-ic.com.com FEATURES PIN ASSIGNMENT Automatically restarts a microprocessor after 3 power failure Maintains reset for 150ms after VCC returns to an in-tolerance condition Reduces need for discrete components Precision temperature-compensated voltage 1 2 reference and voltage sensor SOT-23 PACKAGE Accurate 5%, 10% or 20% power monitoring Low-cost TO-92 or space saving surface- 1 2 3 mount SOT-23 packages available Push-pull output for low current operation 1 2 3 Operating temperature -40 C to +85 C TO-92 PACKAGE See Mech. Drawings Section PIN DESCRIPTION TO-92 1 RST Active Low Reset Output 2 VCC Power Supply 3 GND Ground SOT-23 1 RST Active Low Reset Output 2 VCC Power Supply 3 GND Ground DESCRIPT